A 72-pulse phase-shift rectifier transformer and a number of turns configuration method

Abstract

The application discloses a 72-pulse phase-shifting rectifier transformer and a turn number configuration method. A secondary winding comprises a first winding section, a second winding section and a third winding section, and a primary winding comprises a first winding, a second winding and a third winding. Each winding section comprises four windings, each winding comprises a phase-shifting section and a basic section, the basic section is located in the inner extension of the winding section, and the phase-shifting section is located in the outer extension of the winding section. The phase-shifting angles of the first winding section relative to the first winding are respectively -25°, -10°, 5° and -20°, the phase-shifting angles of the second winding section relative to the second winding are respectively -20°, -5°, 10° and 25°, and the phase-shifting angles of the third winding section relative to the third winding are respectively -15°, 0°, 15° and 30°. Twelve phase-shifting angles are used to output a three-phase circuit, a better power supply than the same winding elimination harmonic ability is obtained, multiple harmonics can be eliminated, high-order harmonics can be effectively suppressed, and temperature rise and loss can be reduced.

Description

Technical Field

[0001] This invention relates to the field of phase-shifting transformer technology, and in particular to a 72-pulse phase-shifting rectifier transformer and a method for configuring the number of turns. Background Technology

[0002] With the continuous development of electronic power, the scale of the power grid has expanded rapidly, and the short-circuit capacity has increased dramatically, leading to situations where the short-circuit current level exceeds the breaking capacity of the circuit breaker. Compared with conventional transformers, high-impedance transformers have a greater short-circuit impedance, which can effectively limit the short-circuit current.

[0003] In existing technologies, the traditional 72-pulse phase-shifting transformer structure consists of three main components with the same angle: a main iron core, a primary winding, and a secondary winding. High impedance requirements are often achieved by increasing the number of turns. However, this method has the following problems: increasing the number of turns increases the size of the transformer structure and raises the cost; the inrush current multiple is large, resulting in high inrush current when closing the circuit; and the secondary winding generates higher-order harmonics, which in turn increases the temperature rise and losses.

[0004] Therefore, there is an urgent need for a reliable 72-pulse phase-shifting rectifier transformer that meets the requirements of high impedance, low inrush current, elimination of high-order harmonics. Summary of the Invention

[0005] The purpose of this invention is to provide a 72-pulse phase-shifting rectifier transformer and a turns configuration method to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0006] The solution to the technical problem of this invention is to provide a 72-pulse phase-shifting rectifier transformer and a method for configuring the number of turns.

[0007] According to an embodiment of a first aspect of the present invention, a 72-pulse phase-shifting rectifier transformer is provided. The transformer includes a primary winding, a secondary winding, and a main core column. The primary winding is wound on the main core column. The secondary winding includes a first winding segment, a second winding segment, and a third winding segment.

[0008] The first winding segment, the second winding segment, and the third winding segment are all wound around the outside of the primary winding. Each winding segment includes four windings, and each winding includes a phase-shifting segment and a basic segment. The basic segment is located on the inner extension of the winding segment, and the phase-shifting segment is located on the outer extension of the winding segment.

[0009] The phase shift angles of the first winding segment relative to the primary winding are -25°, -10°, 5°, and -20°, respectively; the phase shift angles of the second winding segment relative to the primary winding are -20°, -5°, 10°, and 25°, respectively; and the phase shift angles of the third winding segment relative to the primary winding are -15°, 0°, 15°, and 30°, respectively.

[0010] Furthermore, a 72-pulse phase-shifting rectifier transformer also includes: an auxiliary core column;

[0011] The secondary core post is disposed between the secondary winding and the primary winding. The secondary winding is wound around the secondary core post, and the secondary winding covers the secondary core post, the primary winding, and the main core post.

[0012] Furthermore, a 72-pulse phase-shifting rectifier transformer also includes: an air gap partition;

[0013] The main iron core column is provided with several air gaps, and the air gap partition is disposed in several air gaps.

[0014] Furthermore, the main core post includes: an upper yoke, a lower yoke, and a core post;

[0015] The top of the upper yoke oblique joint core column and the bottom of the lower yoke oblique joint core column.

[0016] According to a second aspect of the present invention, a method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer is provided, applied to a 72-pulse phase-shifting rectifier transformer described in the first aspect of the present invention, comprising the following steps:

[0017] Obtain the connection group and primary rated voltage of the primary winding, and determine the primary number of primary turns and primary reference angle of the primary winding;

[0018] Determine the required phase shift angle for the current winding in the secondary winding, and calculate the turn voltage of the primary winding based on the number of primary turns, connection group, and primary rated voltage;

[0019] Select a range of reference angles, and based on the range of primary reference angles and reference angles, use the turn voltage and the required phase shift angle to calculate the number of turns in the phase shift segment and the number of turns in the basic segment of the secondary winding.

[0020] The input voltage is supplied to the primary winding to obtain the output voltage of the secondary winding, and the phase angle of the output voltage relative to the input voltage is obtained. The phase angle is then confirmed to be the required phase shift angle.

[0021] Furthermore, the calculation process for the number of turns in the phase-shifting section of the secondary winding includes:

[0022] When the primary reference angle α1 = 0° is determined, the no-load voltage U2 of the secondary winding is obtained, and the voltage U of the phase-shifted segment is calculated using the required phase-shift angle α2. y U y =2 / (3^0.5)*U2*sin(30°-α2);

[0023] Using the turn voltage et and the phase-shifting segment voltage U y Calculate the number of turns T of the phase shift section.y [T] y ] = U y / et.

[0024] Furthermore, the calculation process for the number of turns in the basic section of the secondary winding includes:

[0025] Using the voltage U of the phase shift segment y 1. Determine the required phase shift angle α2 and no-load voltage U2, determine the range of reference angle α3, and calculate the voltage U of the basic segment. j ;

[0026] Where, when α3 < 30°, U j =2 / (3^0.5)*U2*sin(150°-α2)-U y , when α3>30°, U j =2 / (3^0.5)*U2*sin(90°+α2)-U y ;

[0027] Using the turn voltage et and the basic segment voltage U j Calculate the number of turns T of the basic section. j [T] j ] = U j / et.

[0028] Furthermore, the calculation process for the number of turns in the phase-shifting section of the secondary winding includes:

[0029] When the primary reference angle α1 = 30° is determined, the no-load voltage U2 of the secondary winding is obtained, and the voltage U of the phase-shifted segment is calculated using the required phase-shift angle α2. y U y = 2 / (3^0.5)*U2*sin(α2);

[0030] Using the turn voltage et and the phase-shifting segment voltage U y Calculate the number of turns T of the phase shift section. y [T] y ] = U y / et.

[0031] Furthermore, the calculation process for the number of turns in the basic section of the secondary winding includes:

[0032] Using the voltage U of the phase shift segment y 1. Determine the required phase shift angle α2 and no-load voltage U2, determine the range of reference angle α3, and calculate the voltage U of the basic segment. j ;

[0033] Where, when α3 < 30°, U j =2 / (3^0.5)*U2*sin(150°-α2-30°)-Uy , when α3>30°, U j =2 / (3^0.5)*U2*sin(90°+α2+30°)-U y ;

[0034] Using the turn voltage et and the basic segment voltage U j Calculate the number of turns T of the basic section. j [T] j ] = U j / et.

[0035] Furthermore, the calculation process for the turn voltage of the primary winding includes:

[0036] Determine whether the primary winding in the connection group is star-connected. If so, the formula for calculating the turn voltage et is et = U. n / (3^0.5) / W;

[0037] If not, then the primary winding is delta-connected, and the formula for calculating the turn voltage et is et = U. n / W, where, U n Where is the primary rated voltage, and W is the number of primary turns.

[0038] The beneficial effects of this invention are as follows: The secondary winding is configured with a first winding segment, a second winding segment, and a third winding segment, which correspond to the primary winding. Each winding segment outputs four phase shift angles, allowing the secondary winding to form twelve phase shift angle outputs, thus producing a three-phase circuit. Compared to traditional phase-shifting transformers that use four phase shift angles repeated three times to form a three-phase circuit, this invention uses twelve phase shift angles across three winding segments to output a three-phase circuit, resulting in a power supply with better harmonic suppression capabilities than the same winding configuration. This eliminates multiple harmonics, effectively suppresses higher-order harmonics, and reduces temperature rise and losses. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a 72-pulse phase-shifting rectifier transformer provided by the present invention;

[0040] Figure 2 This is a schematic diagram of the main core column of a 72-pulse phase-shifting rectifier transformer provided by the present invention;

[0041] Figure 3 This is a schematic diagram of the phase shift angle of the secondary winding of a 72-pulse phase-shifting rectifier transformer according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the phase shift angle of the secondary winding of a 72-pulse phase-shifting rectifier transformer according to another embodiment of the present invention;

[0043] Figure 5This is a flowchart illustrating a method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer provided by the present invention.

[0044] Reference numerals: 100, primary winding; 200, secondary winding; 300, main core post; 310, upper yoke; 320, lower yoke; 330, core post; 400, auxiliary core post; 500, air gap partition. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and should not be construed as limiting the scope of the invention.

[0046] It should be noted that although functional modules are divided in the system diagram, in some cases, the steps shown or described may be executed in a different order than the module division or flowchart shown in the system. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0048] According to an embodiment of the first aspect of the present invention, referring to Figures 1 to 4 A 72-pulse phase-shifting rectifier transformer includes: a primary winding 100, a secondary winding 200, and a main core column 300.

[0049] The primary winding 100 is wound around the main iron core column 300, and the secondary winding 200 is wound around the outside of the primary winding 100. The secondary winding 200 includes a first winding section, a second winding section, and a third winding section.

[0050] The first winding segment is wound around the outside of the primary winding 100, enclosing the primary winding 100 and the main iron core column 300. The first winding segment has four windings.

[0051] The second winding section is wound around the outside of the primary winding 100, wrapping the primary winding 100 and the main iron core column 300. The second winding section has four windings.

[0052] The third winding segment wraps around the outer side of the primary winding 100, enclosing the primary winding 100 and the main iron core column 300. The third winding segment has four windings. That is, the secondary winding 200 has twelve windings.

[0053] In the secondary winding 200, each winding group includes a phase-shifting section and a basic section. By adjusting the number of turns in the phase-shifting section and the number of turns in the basic section, the corresponding required phase-shifting angle can be matched.

[0054] The phase shift angles output by the first winding section are -25°, -10°, 5°, and -20°, respectively; the phase shift angles output by the second winding section are -20°, -5°, 10°, and 25°, respectively; and the phase shift angles output by the third winding section are -15°, 0°, 15°, and 30°, respectively.

[0055] The secondary winding 200 is configured with a first winding segment, a second winding segment, and a third winding segment. The three winding segments are configured in correspondence with the primary winding 100. Each winding segment outputs four phase shift angles, and the secondary winding 200 can form twelve phase shift angle outputs, thereby outputting a three-phase circuit.

[0056] The existing 72-pulse phase-shifting transformer structure consists of three main components with the same angle: a main core, a primary winding, and a secondary winding. High impedance requirements are met by increasing the number of turns. However, this method has the following problems: increasing the number of turns increases the transformer's size and cost; the inrush current is relatively large, resulting in high inrush current during closing; and the secondary winding generates higher-order harmonics, thus increasing temperature rise and losses. Compared with the existing technology, a power supply with better harmonic suppression capability for the same winding can eliminate multiple harmonics, effectively suppress higher-order harmonics, and reduce temperature rise and losses.

[0057] Reference Figures 1 to 4 In some embodiments of the present invention, a 72-pulse phase-shifting rectifier transformer further includes: a secondary core column 400 and an air gap partition 500.

[0058] A secondary core post 400 is provided between the secondary winding 200 and the primary winding 100, and the secondary winding 200 is wound around the secondary core post 400. The secondary winding 200 encloses the primary core post 300, the primary winding 100, and the secondary core post 400. That is to say, in the transformer, from the inside out, the sequence is: primary core post 300, primary winding 100, secondary core post 400, and secondary winding 200. The addition of the secondary core post 400 between the primary winding 100 and the secondary winding 200 increases the overall impedance, thereby reducing the load protection switch selection for the secondary winding 200.

[0059] The main core column 300 has several air gaps, and each air gap is equipped with an air gap partition 500. That is to say, each core column of the main core column 300 has several air gaps added, and several air gap partitions 500 are inserted accordingly.

[0060] In this embodiment, an air gap may be added to each main core post 300, with a corresponding air gap partition 500 inserted. The number of air gaps on the main core post 300 is not limited in this invention.

[0061] An air gap and air gap plate are added to the main core column 300 to further suppress the high inrush current that occurs when the number of turns is increased to meet the high impedance, that is, to suppress the inrush current generated by setting twelve sets of windings.

[0062] Reference Figures 1 to 4 In some embodiments of the present invention, the main core post 300 includes: an upper yoke 310, a lower yoke 320, and a core post 330.

[0063] The primary winding 100 is wound on the iron core post 330, and there are three corresponding iron core posts 330.

[0064] The core post 330 is connected to the upper yoke 310 and the lower yoke 320 using a mitered joint technique. Specifically, the top of the core post 330 overlaps with the upper yoke 310 via a mitered joint, and the bottom of the core post 330 overlaps with the lower yoke 320 via a mitered joint. This reduces losses and prevents gaps from forming at the overlaps between the upper yoke 310, lower yoke 320, and core post 330.

[0065] Based on the structure of the main iron core column 300 with a slanted joint, the present invention inserts multiple air gap baffles 500 in the middle of each iron core column 330 to prevent gaps in the overlap between the upper iron yoke 310, the lower iron yoke 320 and the iron core column 330, while suppressing high inrush flow.

[0066] According to an embodiment of the second aspect of the present invention, applied to an embodiment of the first aspect of the present invention, reference is made to... Figure 5 A method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer specifically includes the following steps:

[0067] S100: Obtain the connection group and primary rated voltage of the primary winding, and determine the primary number of primary turns and primary reference angle of the primary winding.

[0068] In this embodiment, the primary reference angle is typically 0° or 30°. Depending on the reference angle, the phase shift angle of the secondary winding will be offset based on the connection group. The ratio of the number of turns in the primary winding to the number of turns in the secondary winding affects the magnitude of the output voltage of the secondary winding. The voltage ratio of the windings is related to the turns ratio and the connection group of the windings. Therefore, the number of turns in the primary winding can be determined by setting the connection group and the rated voltage of the primary winding, and the reference angle of the current primary winding can also be determined.

[0069] S200 determines the required phase shift angle of the current winding in the secondary winding, and calculates the turn voltage of the primary winding based on the number of primary turns, connection group, and primary rated voltage.

[0070] In this embodiment, to meet the high impedance requirement of the transformer, the number of turns in the winding is increased. Therefore, the secondary winding will have several windings, each with a different phase shift angle. Thus, it is necessary to determine the output angle of the secondary winding, i.e., to determine the required phase shift angle for the current winding.

[0071] Once the number of primary turns and the required phase shift angle are determined, the corresponding turn voltage in the primary winding is also determined. In this embodiment, based on the number of primary turns and the primary rated voltage obtained in S100, and according to the winding connection method of the primary winding in the connection group, the calculation formula for the turn voltage is determined, thereby calculating the turn voltage of the primary winding and obtaining the turn voltage under different connection methods.

[0072] S300: Select the range of reference angles. Based on the range of primary reference angles and reference angles, use the turn voltage and the required phase shift angle to calculate the number of turns in the phase shift section and the number of turns in the basic section of the secondary winding.

[0073] In this embodiment, the number of primary turns and the required phase shift angle are determined, and the turn voltage in the primary winding is also determined. The turn ratio of the phase shift segment and the basic segment in the secondary winding is determined accordingly, which will affect the output angle. Therefore, the turn voltage and the required phase shift angle can be the main influencing factors of the turn ratio of the phase shift segment and the basic segment.

[0074] By using the primary reference angle and the range of the reference angle obtained in S100, the turn voltage obtained in S200, and the required phase shift angle, the calculation formulas for the number of turns in the phase shift section and the number of turns in the basic section are determined. Thus, the number of turns in the phase shift section and the number of turns in the basic section are calculated to obtain the turn configuration of the phase shift section and the basic section of the current winding at different angles.

[0075] S400 supplies the input voltage to the primary winding, obtains the output voltage of the secondary winding, and obtains the phase angle of the output voltage relative to the input voltage, confirming that the phase angle is the required phase shift angle.

[0076] In this embodiment, the primary winding is energized, the output voltage waveform of the secondary winding is obtained, the phase angle is obtained by comparing the waveforms of the input voltage and the output voltage, and it is determined whether the phase angle is consistent with the required phase shift angle. If not, the process returns to S200 and the number of turns configuration of the phase shift segment and the basic segment in the current winding is recalculated.

[0077] In the 72-pulse phase-shifting rectifier transformer of the present invention, the secondary winding of the transformer can output different phase-shifting angles to suppress high-order harmonics. By configuring the number of turns of the three winding segments of the secondary coil of the 72-pulse phase-shifting rectifier transformer through the above steps, each winding segment outputs four phase-shifting angles, and the secondary winding can form twelve phase-shifting angle outputs, thereby outputting a three-phase circuit. This allows for the use of different phase-shifting angles. Compared with the traditional phase-shifting transformer, which uses four phase-shifting angles repeated three times to form a three-phase circuit, the present invention uses twelve angles in three winding segments to output a three-phase circuit, resulting in a power supply with better harmonic suppression capability than the same winding.

[0078] The existing 72-pulse phase-shifting transformer structure consists of three main components with the same angle: a main core, a primary winding, and a secondary winding. High impedance requirements are met by increasing the number of turns. However, this method has the following problems: increasing the number of turns increases the transformer's size and cost; the inrush current is relatively large, resulting in high inrush current during closing; and the secondary winding generates higher-order harmonics, thus increasing temperature rise and losses. Compared with the existing technology, a power supply with better harmonic suppression capability for the same winding can eliminate multiple harmonics, effectively suppress higher-order harmonics, and reduce temperature rise and losses.

[0079] In some embodiments of the present invention, in S300, the calculation process for the number of turns in the phase-shifting section and the number of turns in the basic section of the secondary winding specifically includes the following steps:

[0080] S310, when the primary reference angle α1 is 0°, the voltage U of the phase-shifting segment is adjusted using the no-load voltage U2 of the secondary winding and the required phase-shifting angle α2. y Perform the calculation.

[0081] In this embodiment, when the primary reference angle α1 is 0°, the secondary winding is offset based on the connection group Yy0, that is, both the primary and secondary windings adopt a star connection.

[0082] In the secondary winding, when α1 = 0°, the voltage U of the phase-shifting segment is... y The calculation formula is:

[0083] U y = 2 / (3^0.5)*U2*sin(30°-α2)

[0084] Where U2 is the no-load voltage of the secondary winding, and α2 is the required phase shift angle of the current winding in the secondary winding.

[0085] S311, using the turn voltage et obtained in S200 and the phase-shifting segment voltage U obtained in S310. y The number of turns T of the phase shift section y Perform the calculation.

[0086] In this embodiment, the turn voltage et obtained in S200 and the phase-shifting segment voltage U obtained in S310 are utilized. y The formula for calculating the number of turns of the phase shift section.

[0087] [T y ] = U y / et

[0088] The number of turns T of the phase-shifting section is obtained by calculation and rounding. y Where [] is the integer part number.

[0089] S312, using the range of reference angle α3, utilizes the voltage U of the phase-shifting segment obtained in S310. y Given the required phase shift angle α2 and the no-load voltage U2, determine the voltage U of the basic segment. j The calculation formula yields the voltage U of the basic segment. j .

[0090] In this embodiment, the voltage U of the phase-shifting segment obtained in S310 is used. y The primary reference angle α1 is determined to be 0° at this point. The voltage U of the basic segment is determined by the range of the reference angle α3. j The calculation formula;

[0091] When α3 < 30°, that is, when α1 = 0° and α3 < 30°,

[0092] U j =2 / (3^0.5)*U2*sin(150°-α2)-U y

[0093] When α3 > 30°, and when α1 = 0° and α3 < 30°,

[0094] U j =2 / (3^0.5)*U2*sin(90°+α2)-U y

[0095] Where U2 is the no-load voltage of the secondary winding, and α2 is the required phase shift angle of the current winding in the secondary winding.

[0096] Based on the corresponding angle, the corresponding calculation formula is determined, thereby calculating the voltage U of the basic segment. j .

[0097] S313, using the turn voltage et obtained in S200 and the basic segment voltage U obtained in S312. j The number of turns T of the phase shift section y Perform the calculation.

[0098] In this embodiment, the turn voltage et obtained in S200 and the basic segment voltage U obtained in S310 are utilized. j The number of turns of the basic section is calculated using the formula.

[0099] [T j ] = U j / et

[0100] The number of turns T of the basic segment is obtained by calculation and rounding. j , where [] is the integer part.

[0101] By using S310 to S313, the number of turns T of the phase shift segment within the range of the two reference angles α3 when the primary reference angle α1 is 0° is calculated. y and the number of turns T of the basic section j .

[0102] In some embodiments of the present invention, in S300, the calculation process for the number of turns in the phase-shifting section and the number of turns in the basic section of the secondary winding further includes the following steps:

[0103] S320, when the primary reference angle α1 is 30°, the voltage U of the phase-shifting segment is adjusted using the no-load voltage U2 of the secondary winding and the required phase-shifting angle α2. y Perform the calculation.

[0104] In this embodiment, when the primary reference angle α1 is 30°, the secondary winding is offset based on the connection group Yd1 or Yd11. That is, the primary winding adopts a star connection and the secondary winding adopts a delta connection.

[0105] In the secondary winding, when α1 = 30°, the voltage U of the phase-shifted section is... y The calculation formula is:

[0106] U y =2 / 3^0.5))*U2*sin(α2)

[0107] Where U2 is the no-load voltage of the secondary winding, and α2 is the required phase shift angle of the current winding in the secondary winding.

[0108] S321, using the turn voltage et obtained in S200 and the phase-shifting segment voltage U obtained in S320. y The number of turns T of the phase shift section y Perform the calculation.

[0109] In this embodiment, the turn voltage et obtained in S200 and the phase-shifting segment voltage U obtained in S320 are utilized. y The formula for calculating the number of turns of the phase shift section.

[0110] [T y] = U y / et

[0111] The number of turns T of the phase-shifting section is obtained by calculation and rounding. y , where [] is the integer part.

[0112] S322, using the range of reference angle α3, utilizes the voltage U of the phase-shifting segment obtained from S320. y Given the required phase shift angle α2 and the no-load voltage U2, determine the voltage U of the basic segment. j The calculation formula yields the voltage U of the basic segment. j .

[0113] In this embodiment, the voltage U of the phase-shifting segment obtained in S320 is used. y The primary reference angle α1 is determined to be 0° at this point. The voltage U of the basic segment is determined by the range of the reference angle α3. j The calculation formula;

[0114] When α3 < 30°, that is, when α1 = 30° and α3 < 30°,

[0115] U j =2 / (3^0.5)*U2*sin(150°-α2-30°)-U y

[0116] When α3 > 30°, and when α1 = 30° and α3 < 30°,

[0117] U j =2 / (3^0.5)*U2*sin(90°+α2+30°)-U y

[0118] Where U2 is the no-load voltage of the secondary winding, and α2 is the required phase shift angle of the current winding in the secondary winding.

[0119] Based on the corresponding angle, the corresponding calculation formula is determined, thereby calculating the voltage U of the basic segment. j .

[0120] S323, using the turn voltage et obtained in S200 and the basic segment voltage U obtained in S322. j The number of turns T of the phase shift section y Perform the calculation.

[0121] In this embodiment, the turn voltage et obtained in S200 and the basic segment voltage U obtained in S320 are utilized. j The number of turns of the basic section is calculated using the formula.

[0122] [T j ] = Uj / et

[0123] The number of turns T of the basic segment is obtained by calculation and rounding. j , where [] is the integer part.

[0124] Using S320 to S323, the number of turns T of the phase shift segment within the range of the two reference angles α3 when the primary reference angle α1 is 30° is calculated. y and the number of turns T of the basic section j .

[0125] Through steps S310 to S323, this invention considers the wiring method, reference angle, and range of reference angles in the transformer windings, calculates and determines the required output phase shift angle, and the corresponding number of turns in the phase shift segment and the number of turns in the basic segment of the winding. This reduces the need for continuous testing to determine the number of winding turns in actual transformer production, facilitating rapid determination of the winding turn count and reducing the number of tests.

[0126] In some embodiments of the present invention, the process of calculating the turn voltage of the primary winding in S200 specifically includes the following steps:

[0127] S210, when the primary winding in the connection group adopts a star connection, the formula for calculating the turn voltage et is et = U. n / (3^0.5) / W;

[0128] In this embodiment, when the primary winding is connected in a star configuration, the formula for calculating the turn voltage et is:

[0129] et=U n / (3^0.5) / W

[0130] , among which, U n Where is the primary rated voltage, and W is the primary number of turns.

[0131] S220, when the primary winding is connected in a delta configuration, the formula for calculating the turn voltage et is et = U. n / W.

[0132] In this embodiment, if the primary winding is not star-connected, it can be assumed that the primary winding is delta-connected. Therefore, the formula for calculating the turn voltage et is:

[0133] et=U n / W

[0134] , among which, U n Where is the primary rated voltage, and W is the primary number of turns.

[0135] By using S210 and S220, considering the wiring method in the primary winding, and using the number of turns and rated voltage in the primary winding, the turn voltage et of the primary coil is calculated, which facilitates the selection of the turn ratio for the phase shifting segment and the basic segment of the secondary winding in subsequent steps.

[0136] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer, the transformer comprising a primary winding, a secondary winding, and a main core column, wherein the primary winding is wound around the main core column, characterized in that, The secondary winding includes a first winding segment, a second winding segment, and a third winding segment; The first winding segment, the second winding segment, and the third winding segment are all wound around the outside of the primary winding. Each winding segment includes four windings, and each winding includes a phase-shifting segment and a basic segment. The basic segment is located on the inner extension of the winding segment, and the phase-shifting segment is located on the outer extension of the winding segment. The phase shift angles of the first winding segment relative to the primary winding are -25°, -10°, 5°, and -20°, respectively; the phase shift angles of the second winding segment relative to the primary winding are -20°, -5°, 10°, and 25°, respectively; and the phase shift angles of the third winding segment relative to the primary winding are -15°, 0°, 15°, and 30°, respectively. The method for configuring the number of turns includes: Obtain the connection group and primary rated voltage of the primary winding, and determine the primary number of primary turns and primary reference angle of the primary winding; Determine the required phase shift angle for the current winding in the secondary winding, and calculate the turn voltage of the primary winding based on the number of primary turns, connection group, and primary rated voltage; Select a range of reference angles, and based on the range of primary reference angles and reference angles, use the turn voltage and the required phase shift angle to calculate the number of turns in the phase shift segment and the number of turns in the basic segment of the secondary winding. The input voltage is supplied to the primary winding to obtain the output voltage of the secondary winding, and the phase angle of the output voltage relative to the input voltage is obtained. The phase angle is then confirmed to be the required phase shift angle. The confirmation that the phase angle is the required phase shift angle includes: energizing the primary winding, obtaining the output voltage waveform of the secondary winding, comparing the waveforms of the input voltage and the output voltage to obtain the phase angle, determining whether the phase angle is consistent with the required phase shift angle, and if not, returning to recalculate the number of turns configuration of the phase shift segment and the basic segment in the current winding.

2. The method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer according to claim 1, characterized in that, The transformer also includes: a secondary core column; The secondary core post is disposed between the secondary winding and the primary winding. The secondary winding is wound around the secondary core post, and the secondary winding covers the secondary core post, the primary winding, and the main core post.

3. The method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer according to claim 1, characterized in that, The transformer also includes: an air gap partition; The main iron core column is provided with several air gaps, and the air gap partition is disposed in several air gaps.

4. The method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer according to claim 1, characterized in that, The main iron core column includes: an upper iron yoke, a lower iron yoke, and an iron core column; The top of the upper yoke oblique joint core column and the bottom of the lower yoke oblique joint core column.

5. The method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer according to claim 1, characterized in that, The calculation process for the number of turns in the phase-shifting section of the secondary winding includes: Determine the primary reference angle At that time, obtain the no-load voltage of the secondary winding. And utilize the required phase shift angle Calculate the voltage of the phase-shifting section. , ; Using the turn voltage and the voltage of the phase shifter Calculate the number of turns in the phase-shifting section. , .

6. The method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer according to claim 5, characterized in that, The calculation process for the number of turns in the basic section of the secondary winding includes: Using the voltage of the phase shifter Required phase shift angle and no-load voltage Determine the reference angle Within the range, calculate the voltage of the basic segment. ; in, hour, , hour, ; Using turn voltage and the voltage of the basic segment Calculate the number of turns in the basic section. , .

7. The method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer according to claim 1, characterized in that, The calculation process for the number of turns in the phase-shifting section of the secondary winding includes: Determine the primary reference angle At that time, obtain the no-load voltage of the secondary winding. And utilize the required phase shift angle Calculate the voltage of the phase-shifting section. , ; Using the turn voltage and the voltage of the phase shifter Calculate the number of turns in the phase-shifting section. , .

8. The method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer according to claim 7, characterized in that, The calculation process for the number of turns in the basic section of the secondary winding includes: Utilizing the voltage of the phase shifter Required phase shift angle and no-load voltage Determine the reference angle Within the range, calculate the voltage of the basic segment. ; in, hour, , hour, ; Using turn voltage and the voltage of the basic segment Calculate the number of turns in the basic section. , .

9. The method for configuring the number of turns of a 72-pulse phase-shifting rectifier transformer according to claim 1, characterized in that, The calculation process for the turn voltage of the primary winding includes: Determine whether the primary winding in the connection group is star-connected; if so, then the turn voltage... The calculation formula is: ; If not, then the primary winding is delta-connected, and the turn voltage is... The calculation formula is ,in, The primary rated voltage, This refers to the number of primary turns.

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